<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .outer {
            width: 1090px;
            height: 300px;
            background-color: lightgreen;
            margin: auto;
        }
        .inner {
            width: 100%;
            height: 300px;
            background-color: lightpink;
            position: fixed;
        }
    </style>
</head>
<body>
    <div class="outer">
        <div class="inner"></div>
    </div>
    <div style="height: 1000px"></div>

</body>
</html>